The Draining Sea
This is the highest known island in the Skies, and is actually a massive iceberg. Forces within cause ice to splinter from it, melting and falling onto lower islands as either snow or rain. Several permanent icefalls create the massive Runoff Falls.
The Draining Sea is very inhospitable. As well as the cold, explorers must face savage windstorms, and ice elementals. Those brave scavengers who venture onto the ice to seek frozen fortresses or ruins rarely return.